I have a beautiful large Swiss cheese plant plus others. I recently discovered a rogue that brought in fungus gnat although that plant and I'm afraid others have had to go. The gnats are still here. I'm worried about my beloved plant had her from a baby. Tried tanlin but they still here she's in a very large pot indoors. Any ideas?
Certified GKH Gardening Expert
This article will give you some information and options for control: